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PIKApp/plug-ins/common/sparkle.c

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/* Sparkle --- image filter plug-in for PIKA
* Copyright (C) 1996 by John Beale; ported to Pika by Michael J. Hammel;
*
* It has been optimized a little, bugfixed and modified by Martin Weber
* for additional functionality. Also bugfixed by Seth Burgess (9/17/03)
* to take rowstrides into account when selections are present (bug #50911).
* Attempted reformatting.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* You can contact Michael at mjhammel@csn.net
* You can contact Martin at martweb@gmx.net
* You can contact Seth at sjburges@gimp.org
*/
/*
* Sparkle 1.27 - simulate pixel bloom and diffraction effects
*/
#include "config.h"
#include <string.h>
#include <libpika/pika.h>
#include <libpika/pikaui.h>
#include "libpika/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-sparkle"
#define PLUG_IN_BINARY "sparkle"
#define PLUG_IN_ROLE "pika-sparkle"
#define MAX_CHANNELS 4
#define PSV 2 /* point spread value */
#define NATURAL 0
#define FOREGROUND 1
#define BACKGROUND 2
typedef struct _Sparkle Sparkle;
typedef struct _SparkleClass SparkleClass;
struct _Sparkle
{
PikaPlugIn parent_instance;
};
struct _SparkleClass
{
PikaPlugInClass parent_class;
};
#define SPARKLE_TYPE (sparkle_get_type ())
#define SPARKLE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), SPARKLE_TYPE, Sparkle))
GType sparkle_get_type (void) G_GNUC_CONST;
static GList * sparkle_query_procedures (PikaPlugIn *plug_in);
static PikaProcedure * sparkle_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * sparkle_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data);
static gboolean sparkle_dialog (PikaProcedure *procedure,
GObject *config,
PikaDrawable *drawable);
static gint compute_luminosity (const guchar *pixel,
gboolean gray,
gboolean has_alpha,
gint inverse);
static gint compute_lum_threshold (PikaDrawable *drawable,
gdouble percentile,
gint inverse);
static void sparkle (GObject *config,
PikaDrawable *drawable,
PikaPreview *preview);
static void sparkle_preview (GtkWidget *widget,
GObject *config);
static void fspike (GObject *config,
GeglBuffer *src_buffer,
GeglBuffer *dest_buffer,
const Babl *format,
gint bytes,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gdouble inten,
gdouble length,
gdouble angle,
GRand *gr,
guchar *dest_buf);
static void rpnt (GObject *config,
GeglBuffer *dest_buffer,
const Babl *format,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint bytes,
gdouble inten,
guchar color[MAX_CHANNELS],
guchar *dest_buf);
G_DEFINE_TYPE (Sparkle, sparkle, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (SPARKLE_TYPE)
DEFINE_STD_SET_I18N
static gint num_sparkles;
static void
sparkle_class_init (SparkleClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = sparkle_query_procedures;
plug_in_class->create_procedure = sparkle_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
sparkle_init (Sparkle *sparkle)
{
}
static GList *
sparkle_query_procedures (PikaPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static PikaProcedure *
sparkle_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
sparkle_run, NULL, NULL);
pika_procedure_set_image_types (procedure, "RGB*, GRAY*");
pika_procedure_set_sensitivity_mask (procedure,
PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
pika_procedure_set_menu_label (procedure, _("_Sparkle..."));
pika_procedure_add_menu_path (procedure,
"<Image>/Filters/Light and Shadow/[Light]");
pika_procedure_set_documentation (procedure,
_("Turn bright spots into "
"starry sparkles"),
_("Uses a percentage based luminosity "
"threshold to find candidate pixels "
"for adding some sparkles (spikes)."),
name);
pika_procedure_set_attribution (procedure,
"John Beale, & (ported to PIKA v0.54) "
"Michael J. Hammel & ted to PIKA v1.0) "
"& Seth Burgess & Spencer Kimball",
"John Beale",
"Version 1.27, September 2003");
PIKA_PROC_ARG_DOUBLE (procedure, "lum-threshold",
_("Lu_minosity threshold"),
_("Adjust the luminosity threshold"),
0.0, 0.1, 0.01,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "flare-inten",
_("_Flare intensity"),
_("Adjust the flare intensity"),
0.0, 1.0, 0.5,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "spike-len",
_("Spi_ke length"),
_("Adjust the spike length (in pixels)"),
1, 100, 20,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "spike-points",
_("Spike _points"),
_("Adjust the number of spikes"),
1, 16, 4,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "spike-angle",
_("Spike angle (-_1: random)"),
_("Adjust the spike angle "
"(-1 causes a random angle to be chosen)"),
-1, 360, 15,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "density",
_("Spike _density"),
_("Adjust the spike density"),
0.0, 1.0, 1.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "transparency",
_("_Transparency"),
_("Adjust the opacity of the spikes"),
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "random-hue",
_("Random _hue"),
_("Adjust how much the hue should be "
"changed randomly"),
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_DOUBLE (procedure, "random-saturation",
_("R_andom saturation"),
_("Adjust how much the saturation should be "
"changed randomly"),
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
PIKA_PROC_ARG_BOOLEAN (procedure, "preserve-luminosity",
_("Preserve l_uminosity"),
_("Should the luminosity be preserved?"),
FALSE,
G_PARAM_READWRITE);
PIKA_PROC_ARG_BOOLEAN (procedure, "inverse",
_("In_verse"),
_("Should the effect be inversed?"),
FALSE,
G_PARAM_READWRITE);
PIKA_PROC_ARG_BOOLEAN (procedure, "border",
_("Add _border"),
_("Draw a border of spikes around the image"),
FALSE,
G_PARAM_READWRITE);
PIKA_PROC_ARG_INT (procedure, "color-type",
_("Color type"),
_("Color of sparkles: { NATURAL (0), "
"FOREGROUND (1), BACKGROUND (2) }"),
0, 2, NATURAL,
G_PARAM_READWRITE);
}
return procedure;
}
static PikaValueArray *
sparkle_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data)
{
PikaDrawable *drawable;
gint x, y, w, h;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
if (! pika_drawable_mask_intersect (drawable, &x, &y, &w, &h))
{
g_message (_("Region selected for filter is empty"));
return pika_procedure_new_return_values (procedure,
PIKA_PDB_SUCCESS,
NULL);
}
if (run_mode == PIKA_RUN_INTERACTIVE && ! sparkle_dialog (procedure, G_OBJECT (config), drawable))
return pika_procedure_new_return_values (procedure,
PIKA_PDB_CANCEL,
NULL);
if (pika_drawable_is_rgb (drawable) ||
pika_drawable_is_gray (drawable))
{
pika_progress_init (_("Sparkling"));
sparkle (G_OBJECT (config), drawable, NULL);
if (run_mode != PIKA_RUN_NONINTERACTIVE)
pika_displays_flush ();
}
else
{
return pika_procedure_new_return_values (procedure,
PIKA_PDB_EXECUTION_ERROR,
NULL);
}
return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
}
static gboolean
sparkle_dialog (PikaProcedure *procedure,
GObject *config,
PikaDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *preview;
GtkWidget *hbox;
GtkWidget *scale;
GtkListStore *store;
gboolean run;
pika_ui_init (PLUG_IN_BINARY);
dialog = pika_procedure_dialog_new (procedure,
PIKA_PROCEDURE_CONFIG (config),
_("Sparkle"));
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
pika_window_set_transient (GTK_WINDOW (dialog));
gtk_widget_set_size_request (dialog, 430, -1);
gtk_container_set_border_width (
GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG (dialog))), 12);
preview = pika_drawable_preview_new_from_drawable (drawable);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"lum-threshold", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"flare-inten", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"spike-len", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"spike-points", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"spike-angle", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"density", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"density", 1.0);;
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"transparency", 1.0);
pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"random-hue", 1.0);
scale = pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
"random-saturation", 1.0);
gtk_widget_set_margin_bottom (scale, 12);
pika_procedure_dialog_fill_box (PIKA_PROCEDURE_DIALOG (dialog),
"sparkle-bool-vbox",
"preserve-luminosity", "inverse",
"border", NULL);
pika_procedure_dialog_get_label (PIKA_PROCEDURE_DIALOG (dialog),
"sparkle-bool-label",
_("Additional Options"),
FALSE, FALSE);
pika_procedure_dialog_fill_frame (PIKA_PROCEDURE_DIALOG (dialog),
"sparkle-bool-frame", "sparkle-bool-label",
FALSE, "sparkle-bool-vbox");
/* colortype */
store = pika_int_store_new (_("Natural color"), NATURAL,
_("Foreground color"), FOREGROUND,
_("Background color"), BACKGROUND,
NULL);
pika_procedure_dialog_get_int_radio (PIKA_PROCEDURE_DIALOG (dialog),
"color-type", PIKA_INT_STORE (store));
hbox = pika_procedure_dialog_fill_box (PIKA_PROCEDURE_DIALOG (dialog),
"sparkle-row", "sparkle-bool-frame",
"color-type", NULL);
gtk_orientable_set_orientation (GTK_ORIENTABLE (hbox),
GTK_ORIENTATION_HORIZONTAL);
gtk_box_set_spacing (GTK_BOX (hbox), 12);
gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
gtk_widget_set_margin_bottom (hbox, 12);
g_object_set_data (config, "drawable", drawable);
g_signal_connect (preview, "invalidated",
G_CALLBACK (sparkle_preview),
config);
g_signal_connect_swapped (config, "notify",
G_CALLBACK (pika_preview_invalidate),
preview);
pika_procedure_dialog_fill (PIKA_PROCEDURE_DIALOG (dialog),
"lum-threshold", "flare-inten", "spike-len",
"spike-points", "spike-angle", "density",
"transparency", "random-hue",
"random-saturation", "sparkle-row",
NULL);
gtk_widget_show (dialog);
run = pika_procedure_dialog_run (PIKA_PROCEDURE_DIALOG (dialog));
gtk_widget_destroy (dialog);
return run;
}
static gint
compute_luminosity (const guchar *pixel,
gboolean gray,
gboolean has_alpha,
gint inverse)
{
gint pixel0, pixel1, pixel2;
if (inverse)
{
pixel0 = 255 - pixel[0];
pixel1 = 255 - pixel[1];
pixel2 = 255 - pixel[2];
}
else
{
pixel0 = pixel[0];
pixel1 = pixel[1];
pixel2 = pixel[2];
}
if (gray)
{
if (has_alpha)
return (pixel0 * pixel1) / 255;
else
return (pixel0);
}
else
{
gint min, max;
min = MIN (pixel0, pixel1);
min = MIN (min, pixel2);
max = MAX (pixel0, pixel1);
max = MAX (max, pixel2);
if (has_alpha)
return ((min + max) * pixel[3]) / 510;
else
return (min + max) / 2;
}
}
static gint
compute_lum_threshold (PikaDrawable *drawable,
gdouble percentile,
gint inverse)
{
GeglBuffer *src_buffer;
GeglBufferIterator *iter;
const Babl *format;
gint bpp;
gint values[256];
gint total, sum;
gboolean gray;
gboolean has_alpha;
gint i;
gint x1, y1;
gint width, height;
/* zero out the luminosity values array */
memset (values, 0, sizeof (gint) * 256);
if (! pika_drawable_mask_intersect (drawable,
&x1, &y1, &width, &height))
return 0;
gray = pika_drawable_is_gray (drawable);
has_alpha = pika_drawable_has_alpha (drawable);
if (gray)
{
if (has_alpha)
format = babl_format ("Y'A u8");
else
format = babl_format ("Y' u8");
}
else
{
if (has_alpha)
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
}
bpp = babl_format_get_bytes_per_pixel (format);
src_buffer = pika_drawable_get_buffer (drawable);
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 1);
while (gegl_buffer_iterator_next (iter))
{
const guchar *src = iter->items[0].data;
gint length = iter->length;
while (length--)
{
values [compute_luminosity (src, gray, has_alpha, inverse)]++;
src += bpp;
}
}
g_object_unref (src_buffer);
total = width * height;
sum = 0;
for (i = 255; i >= 0; i--)
{
sum += values[i];
if ((gdouble) sum > percentile * (gdouble) total)
{
num_sparkles = sum;
return i;
}
}
return 0;
}
static void
sparkle (GObject *config,
PikaDrawable *drawable,
PikaPreview *preview)
{
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
GeglBufferIterator *iter;
const Babl *format;
gint d_width, d_height;
gdouble nfrac, length, inten, spike_angle;
gint cur_progress, max_progress;
gint x1, y1, x2, y2;
gint width, height;
gint threshold;
gint lum, x, y, b;
gboolean gray, has_alpha;
gint alpha;
gint bytes;
GRand *gr;
guchar *dest_buf = NULL;
gdouble lum_threshold;
gdouble flare_inten;
gint spike_len;
gint spike_pts;
gint spike_angle_config;
gdouble density;
gint inverse;
gint border;
g_object_get (config,
"lum-threshold", &lum_threshold,
"flare-inten", &flare_inten,
"spike-len", &spike_len,
"spike-points", &spike_pts,
"spike-angle", &spike_angle_config,
"density", &density,
"inverse", &inverse,
"border", &border,
NULL);
gray = pika_drawable_is_gray (drawable);
has_alpha = pika_drawable_has_alpha (drawable);
if (gray)
{
if (has_alpha)
format = babl_format ("Y'A u8");
else
format = babl_format ("Y' u8");
}
else
{
if (has_alpha)
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
}
bytes = babl_format_get_bytes_per_pixel (format);
alpha = (has_alpha) ? bytes - 1 : bytes;
if (preview)
{
pika_preview_get_position (preview, &x1, &y1);
pika_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
dest_buf = g_new0 (guchar, width * height * bytes);
}
else
{
if (! pika_drawable_mask_intersect (drawable,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
}
if (width < 1 || height < 1)
return;
d_width = pika_drawable_get_width (drawable);
d_height = pika_drawable_get_height (drawable);
gr = g_rand_new ();
if (border)
{
num_sparkles = 2 * (width + height);
threshold = 255;
}
else
{
/* compute the luminosity which exceeds the luminosity threshold */
threshold = compute_lum_threshold (drawable, lum_threshold, inverse);
}
/* initialize the progress dialog */
cur_progress = 0;
max_progress = num_sparkles;
/* copy what is already there */
src_buffer = pika_drawable_get_buffer (drawable);
dest_buffer = pika_drawable_get_shadow_buffer (drawable);
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
gegl_buffer_iterator_add (iter, dest_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
GeglRectangle roi = iter->items[0].roi;
const guchar *src, *s;
guchar *dest, *d;
src = iter->items[0].data;
if (preview)
dest = dest_buf + (((roi.y - y1) * width) + (roi.x - x1)) * bytes;
else
dest = iter->items[1].data;
for (y = 0; y < roi.height; y++)
{
s = src;
d = dest;
for (x = 0; x < roi.width; x++)
{
if (has_alpha && s[alpha] == 0)
{
memset (d, 0, alpha);
}
else
{
for (b = 0; b < alpha; b++)
d[b] = s[b];
}
if (has_alpha)
d[alpha] = s[alpha];
s += bytes;
d += bytes;
}
src += roi.width * bytes;
if (preview)
dest += width * bytes;
else
dest += roi.width * bytes;
}
}
/* add effects to new image based on intensity of old pixels */
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
gegl_buffer_iterator_add (iter, dest_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
GeglRectangle roi = iter->items[0].roi;
const guchar *src, *s;
src = iter->items[0].data;
for (y = 0; y < roi.height; y++)
{
s = src;
for (x = 0; x < roi.width; x++)
{
if (border)
{
if (x + roi.x == 0 ||
y + roi.y == 0 ||
x + roi.x == d_width - 1 ||
y + roi.y == d_height - 1)
{
lum = 255;
}
else
{
lum = 0;
}
}
else
{
lum = compute_luminosity (s, gray, has_alpha, inverse);
}
if (lum >= threshold)
{
nfrac = fabs ((gdouble) (lum + 1 - threshold) /
(gdouble) (256 - threshold));
length = ((gdouble) spike_len *
(gdouble) pow (nfrac, 0.8));
inten = flare_inten * nfrac;
/* fspike im x,y intens rlength angle */
if (spike_pts > 0)
{
/* major spikes */
if (spike_angle_config == -1)
spike_angle = g_rand_double_range (gr, 0, 360.0);
else
spike_angle = spike_angle_config;
if (g_rand_double (gr) <= density)
{
fspike (config, src_buffer, dest_buffer, format,
bytes, x1, y1, x2, y2,
x + roi.x, y + roi.y,
inten, length, spike_angle, gr, dest_buf);
/* minor spikes */
fspike (config, src_buffer, dest_buffer, format,
bytes, x1, y1, x2, y2,
x + roi.x, y + roi.y,
inten * 0.7, length * 0.7,
((gdouble) spike_angle + 180.0 / spike_pts),
gr, dest_buf);
}
}
if (!preview)
{
cur_progress ++;
if ((cur_progress % 5) == 0)
pika_progress_update ((double) cur_progress /
(double) max_progress);
}
}
s += bytes;
}
src += roi.width * bytes;
}
}
g_object_unref (src_buffer);
g_object_unref (dest_buffer);
if (preview)
{
pika_preview_draw_buffer (preview, dest_buf, width * bytes);
g_free (dest_buf);
}
else
{
pika_progress_update (1.0);
pika_drawable_merge_shadow (drawable, TRUE);
pika_drawable_update (drawable, x1, y1, width, height);
}
g_rand_free (gr);
}
static void
sparkle_preview (GtkWidget *widget,
GObject *config)
{
PikaPreview *preview = PIKA_PREVIEW (widget);
PikaDrawable *drawable = g_object_get_data (config, "drawable");
sparkle (config, drawable, preview);
}
static inline void
rpnt (GObject *config,
GeglBuffer *dest_buffer,
const Babl *format,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint bytes,
gdouble inten,
guchar color[MAX_CHANNELS],
guchar *dest_buf)
{
gint x, y, b;
gdouble dx, dy, rs, val;
guchar *pixel;
guchar pixel_buf[4];
gdouble new;
gdouble transparency;
gint preserve_luminosity;
gint inverse;
gint border;
g_object_get (config,
"transparency", &transparency,
"preserve-luminosity", &preserve_luminosity,
"inverse", &inverse,
"border", &border,
NULL);
x = (int) (xr); /* integer coord. to upper left of real point */
y = (int) (yr);
if (x >= x1 && y >= y1 && x < x2 && y < y2)
{
if (dest_buf)
{
pixel = dest_buf + ((y - y1) * (x2 - x1) + (x - x1)) * bytes;
}
else
{
gegl_buffer_sample (dest_buffer, x, y, NULL,
pixel_buf, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
pixel = pixel_buf;
}
dx = xr - x; dy = yr - y;
rs = dx * dx + dy * dy;
val = inten * exp (-rs / PSV);
for (b = 0; b < bytes; b++)
{
if (inverse)
new = 255 - pixel[b];
else
new = pixel[b];
if (preserve_luminosity)
{
if (new < color[b])
{
new *= (1.0 - val * (1.0 - transparency));
}
else
{
new -= val * color[b] * (1.0 - transparency);
if (new < 0.0)
new = 0.0;
}
}
new *= 1.0 - val * transparency;
new += val * color[b];
if (new > 255)
new = 255;
if (inverse)
pixel[b] = 255 - new;
else
pixel[b] = new;
}
if (! dest_buf)
gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x, y, 1, 1), 0,
format, pixel_buf,
GEGL_AUTO_ROWSTRIDE);
}
}
static void
fspike (GObject *config,
GeglBuffer *src_buffer,
GeglBuffer *dest_buffer,
const Babl *format,
gint bytes,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gdouble inten,
gdouble length,
gdouble angle,
GRand *gr,
guchar *dest_buf)
{
const gdouble efac = 2.0;
gdouble xrt, yrt, dx, dy;
gdouble rpos;
gdouble in;
gdouble theta;
gdouble sfac;
gint i;
gboolean ok;
PikaRGB pika_color;
guchar pixel[MAX_CHANNELS];
guchar chosen_color[MAX_CHANNELS];
guchar color[MAX_CHANNELS];
gint spike_pts;
gdouble random_hue;
gdouble random_saturation;
gint inverse;
gint colortype;
g_object_get (config,
"spike-points", &spike_pts,
"random-hue", &random_hue,
"random-saturation", &random_saturation,
"inverse", &inverse,
"color-type", &colortype,
NULL);
theta = angle;
switch (colortype)
{
case NATURAL:
break;
case FOREGROUND:
pika_context_get_foreground (&pika_color);
pika_rgb_get_uchar (&pika_color, &chosen_color[0], &chosen_color[1],
&chosen_color[2]);
break;
case BACKGROUND:
pika_context_get_background (&pika_color);
pika_rgb_get_uchar (&pika_color, &chosen_color[0], &chosen_color[1],
&chosen_color[2]);
break;
}
/* draw the major spikes */
for (i = 0; i < spike_pts; i++)
{
gegl_buffer_sample (dest_buffer, xr, yr, NULL, pixel, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
if (colortype == NATURAL)
{
color[0] = pixel[0];
color[1] = pixel[1];
color[2] = pixel[2];
}
else
{
color[0] = chosen_color[0];
color[1] = chosen_color[1];
color[2] = chosen_color[2];
}
color[3] = pixel[3];
if (inverse)
{
color[0] = 255 - color[0];
color[1] = 255 - color[1];
color[2] = 255 - color[2];
}
if (random_hue > 0.0 || random_saturation > 0.0)
{
PikaRGB rgb;
PikaHSV hsv;
rgb.r = (gdouble) (255 - color[0]) / 255.0;
rgb.g = (gdouble) (255 - color[1]) / 255.0;
rgb.b = (gdouble) (255 - color[2]) / 255.0;
pika_rgb_to_hsv (&rgb, &hsv);
hsv.h += random_hue * g_rand_double_range (gr, -0.5, 0.5);
if (hsv.h >= 1.0)
hsv.h -= 1.0;
else if (hsv.h < 0.0)
hsv.h += 1.0;
hsv.v += (random_saturation *
g_rand_double_range (gr, -1.0, 1.0));
hsv.v = CLAMP (hsv.v, 0.0, 1.0);
pika_hsv_to_rgb (&hsv, &rgb);
color[0] = 255 - ROUND (rgb.r * 255.0);
color[1] = 255 - ROUND (rgb.g * 255.0);
color[2] = 255 - ROUND (rgb.b * 255.0);
}
dx = 0.2 * cos (theta * G_PI / 180.0);
dy = 0.2 * sin (theta * G_PI / 180.0);
xrt = (gdouble) xr; /* (gdouble) is needed because some */
yrt = (gdouble) yr; /* compilers optimize too much otherwise */
rpos = 0.2;
do
{
sfac = inten * exp (-pow (rpos / length, efac));
ok = FALSE;
in = 0.2 * sfac;
if (in > 0.01)
ok = TRUE;
rpnt (config, dest_buffer, format, x1, y1, x2, y2,
xrt, yrt,
bytes, in, color, dest_buf);
rpnt (config, dest_buffer, format, x1, y1, x2, y2,
xrt + 1.0, yrt,
bytes, in, color, dest_buf);
rpnt (config, dest_buffer, format, x1, y1, x2, y2,
xrt + 1.0, yrt + 1.0,
bytes, in, color, dest_buf);
rpnt (config, dest_buffer, format, x1, y1, x2, y2,
xrt, yrt + 1.0,
bytes, in, color, dest_buf);
xrt += dx;
yrt += dy;
rpos += 0.2;
} while (ok);
theta += 360.0 / spike_pts;
}
}
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